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Impacts from these comets could trigger a mass extinction of life on Earth. These disruptive encounters are estimated to occur an average of once every 45 million years. [28] There is a 1% chance every billion years that a star will pass within 100 AU of the Sun, potentially disrupting the Solar System. [29]
This is much faster than the expected “background” extinction rate, or the rate at which species would naturally die off without outside influence — in the absence of human beings, these 73 ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 31 January 2025. Scientific projections regarding the far future Several terms redirect here. For other uses, see List of numbers and List of years. Artist's concept of the Earth 5–7.5 billion years from now, when the Sun has become a red giant While the future cannot be predicted with certainty ...
The canonical definition of existential risk was proposed early by Bostrom in his essay, "Existential Risks: Analyzing Human Extinction Scenarios and Related Hazards", establishing it as a risk "(...) where an adverse outcome would either annihilate Earth-originating intelligent life or permanently and drastically curtail its potential", [20 ...
The cause of the Devonian period extinction 359 million years ago, ranked as one of the five great extinctions of life on Earth, remains a mystery. Now, a new study reveals the explosion of a ...
Scientists say the mass extinction 250 million years ago offers a timely warning to humanity of what can happen when ecosystems change too fast for life to keep up.
Dresbachian extinction event: 502 Ma: End-Botomian extinction event: 517 Ma: Precambrian: End-Ediacaran extinction: 542 Ma: Anoxic event [45] Great Oxygenation Event: 2400 Ma: Rising oxygen levels in the atmosphere due to the development of photosynthesis as well as possible Snowball Earth event. (see: Huronian glaciation.)
According to a study published in the journal 'Science Advances', planet Earth is entering its sixth period of mass extinction. One of the authors noted, "If it is allowed to continue, life would ...